Electric heating element



Feb. 17, 1925.

1,526,843 M. D. DOMINGUEZ ELECTRIC HEATING ELEMENT Filed Nov. 22. 1923 2Sheets-Sheet l im @mm/L7 am: w15

Feb. 17. 1925. 11,526,843

M. D. DOMINGUEZ ELECTRIC HEATING ELEMENT Filed Nov. 22. 1923 2Sheets-Sheet 2 Dom/vowel leans and State of Louisiana,

ffollowing is a specication.

electric heatlng Patented Feb. 17"k 1925.

A UNITED sTATl-:s PATENT OFFICE.

MANUEL D. DOMINGUEZ, 0F

NEW ORLEANS, LOUISIANA, ASSIGNO 0F ONE-HALF TO CHARLES A DENIS umONE-HALF ro GEORGE smi?, Born or NEW ORLEANS,

i ELECTRIC HEATING ELEMENT.

LOUISIANA.

Application nled November 22, 1923.

To all 'wwm t may concern;l

Be it known that I, MANUEL D. `DOMIN- Gonz, a citizen of the UnitedStates, residing at New Orleans,

in the parish of Orhave invented certain new and useful Improvements inElectric Heating Elements,

The invention relates to elements, and has as an object the 0f which theprovision Aof a heating element adapted to be placed within a coiledconduit through which liquid maybe passed and heated by from theresistance coils forming the heating element.

radiation a part of A further object of the invention is the provisionof a heating element which 'may' be assembled and handled as a unit,whereby the same may be removed as a whole from its position of use andreplaced by a like element when necessary. A furt er object of theinvention is the provision of a heating element which is simple ble andrugged and to assemeiiective in use.

Illustrative embodiments of the invention are shown in ing, in which--Fig'ure 1 is a side central vertical section.

Figure 2 is a plan view. Figure 3 is a elevation,

the accompanying drawpartly in plan view and Figure 4 is a detail sideelevation of a. modification.

Flgure 5 is a plan view and is a detail side vlew of a further tion.

Figure 6 modifica- As shown in Figs. 1 and 2, the element comprises endplates 10 and 11 of conducting material, such as copper or brass, eachmounted upon a plate material. To

the coils are openings 15 in the 12 or 13 of insulating provideelectrical contact between the helical resistance elements 14 and p therespective plates 10 and 11, the ends of shown as brought through smallplates through correspending openings in the insulation plates 12 andl13, and as clamped under of screws 16 seated in tapped op the headsenings in the plates 10 and 11, and if desired also penetrating intotapped openings in the plates 12 and 13.

To hold the device in assembly, and also to serve as an electricalconductor from the plate 11 to one of the terminals of t a rod 17 isshown as secured to he device, plates 11 the serial 1ra. 676,413.

and 13, as by means of lock nuts 18, 19, being in electrical connectionwith the plate 11. The plate 12 is preferably'seated upon a nut 20 andthe rod 17 passes through the plates 10 and v12, being msulated from theplate 10 by means of a washer 21 formed of insulating material. A secondwasher 22 also of insulating material permits the.

the rod 17. The provided with holes which seat over the upturnedporwires 25 to maintain the position of rotation of the plates upon therod 17, such position being such that the openings 27 in the plates 24for passage of the resistance elements 14 shall remain in al1 nment. y

ne terminal of the device is shown in form of a rod 28 secured to plates10 by means of lock nuts 29, 30, which terminal is provided with a locknut 31 for clamping of an electrical conductor thereto. The secondterminal 32 is shown as secured to a bracket 33 by means of lock nuts34, 35 holding the same in electrical connection therew1th, and asprovided with a lock nut 36 for attachment of an electrical conductor.The bracket 33 is clamped against the insulating washer 22 by means ofthe nut 23 and is thus in-electrlcal connection with the rod 17 andplate 11, but has no electrical connection with plate 10.

en assembled as shown and described the heating element as a whole makesup a unitary structure which may be freely handled wit-hout fear ofdisarrangement of parts, and in which the resistance elements are freelyexposed, whereby they may radiate their heat to the turns of afluidcontaining coil in which they may be housed, as shown in myco-pending application, Serial Number 709,902 liled April 29, 1923. Inthe form of the device shown in Figs. 3 and 4, the rod-17 is provided tohold the device in assembly as a unit, while the hooks 25 are utilizedto support and align the openings in the insulating plates shaped wires25 are showni Howeveig in this form of the device the-rod 17' is notutilized as an electrical conductor. The end plate 37 is 'an insulatingplate and carriesno plate of conducting material I corresponding toplate 10 of Fig. 1.

To connect the resistance coils in series, there are shown bindingscrews 38, and the ends of the coils 39 are carried through smallopenings in the plate 37 and the two ends to be connected are clamped bymeans of the nut 40 on the binding screw. ,To connect the end elementsof the series of resistance coils with the terminal rods 41, 42 there isshown a ba'r of insulating material 43 mountedupon an extension oftherod 17 by means of a pair of lock nuts 44, and plates of conductingmaterial 45, 46 are carried one at each end 'of the bar 43. The bindingscrews to'be connected with the plates 45, 46 are so connected bymeans-of strips 47,

v48 attached to the plates by means of screws .49, 50, thus lacing theresist-ance coil at each end of the series in electrical conductingrelation with the terminal rods 41, 42. These rods will be rovided attheir upper ends with lock nuts not shown) correspondin to those at 31,36 in Fig. 1.

gl'he advantage of the forms ot the device shown in Figs. 3 to 6inclusive is that they may be made much shorter than the form of Figs. 1and 2, by reason of the fact that the resistors may be placed in series.If it be desired to place series groups of the resistors in parallelwith this form of the device the screws 51, 52, 53 and 54 ma be utilizedfor the attachment of the in 'viduals of the parallel groups in additionto the screws 49 50. A

ln the form of the device of Figs. 5 and 6, the ends of the resistorcoils which are to be placed in series are 'twisted together, as shownat 55, and the ends of the end coils ofthe series are attached to thebinding screws 56, 57. This form of the device also diiers from that ofFigs. 3 and 4 by the form of the plates 59, 59 carried by the insulatibar 43. In this form of the device also ad itional binding screws 60,61,y 62 and 63 are provided, whereby three groups of series connectedresistors may be connected in parallel in conductive relation to theterminal. rods 41 and 42. The bar 43ein this case' is mounted upon thecentral rod 17, which will also carry spacing plates (not shown)correspondin to those at 24 and 24 already described. gIhe resistors maybe placed in series throughoutif the device is to be used with a currentof high voltage.

Minor changes may be made in the physical embodimentof the inventionwithout departing fromits spirit.

I claim:

1. A heating element comprising a supporting and conducting rod,terminal Yplates mounted upon` saidvrod, perforated plates of insulatingmaterial mounted upon said rod,

means carried by the rod to hold said plates d in fixed relativeposit-ion of rotation, the perforations in said plates vbeing inalignment,

resistance elements in .electrical connection wlth sald terminal platesand! passing 'lov through said aligned perforations, and.A

means for connecting said terminal plates in an electrical circuit.

2. A heating element comprising, in combination, a supporting rod,terminal plates mounted upon said supporting rod, said terminal plateshaving tapped openings and a Wire receiving perforation adjacent eachopening, resistance elements having their termina-ls passed through saidperforations,

clamping screws engaging said tapped openings and clamping the ends ofsaid resistance elements to said plates, and means to connect saidplates in an electrical circuit.

3. A heating element comprising, in combination, a supporting rod, aterminal plate clampedto an end of said rod in electrical connectiontherewith, a second terminal plate mounted upon the remaining end ofsaid rod and electrically insulated therefrom, an electrical terminalconductively mounted upon the end of said rod adjacent v said last namedplate, a second electrical terminal electrically connected to said rod,a plurality of insulating Vspacing plates having aligned perforationsand mounted upon said supporting rod, resistance elements passingthrough said aligned openings and havin their ends electricallyconnected to said p ates.

. MANUEL D. DOMINGUEZ.

